# A217143 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 31
4 256
5 2960
6 44169
7 813298
8 17952898
9 465148507
10 13915349132
11 474372594032
12 18228772272441
13 782443669319410
14 37224994809379094
15 1949799331997896119
16 111783178753323665728
17 6978369826387194664144
18 472207139326449254997425